PARIS — Forget that complicated stuff. Pretty clothes are a simple pleasure. And Karl Lagerfeld showed just how refreshing they can be, in a superb spring Chanel couture collection that was full of feminine flourishes. Gentle pink was the most important shade. His leading look, which he presented in many variations, is a fitted coat, worn over a supple suit, both with girly trimmings and flourishes. Here, one example: a cardigan coat with crystal camellias and a flippy little suit. For more on the season, see pages 6 to 8.